Noise and Vibration Worldwide最新文献

Investigation and hybrid deep belief neural network-based validation of piezoelectric bimorph cantilever composites assisted with tip mass 尖端质量辅助下压电双晶片悬臂复合材料的研究与混合深度信念神经网络验证

Noise and Vibration Worldwide Pub Date : 2023-11-09 DOI: 10.1177/09574565231212688

Prashant Vishnu Bhosale, Sudhir D Agashe

{"title":"Investigation and hybrid deep belief neural network-based validation of piezoelectric bimorph cantilever composites assisted with tip mass","authors":"Prashant Vishnu Bhosale, Sudhir D Agashe","doi":"10.1177/09574565231212688","DOIUrl":"https://doi.org/10.1177/09574565231212688","url":null,"abstract":"This work fabricated the piezoelectrical material using PMMA (polymethyl methacrylate) and Ce-doped ZnO nano-powders. The study was conducted to validate the piezoelectric performance of the proposed material and its suitability for the cantilever structure. The PMMA/Ce-ZnO makes the cantilever structure more flexible and performs better. The frequency response is applied to the beam using an electrical circuit to analyze the power and voltage output. The acceleration is given to the cantilever beams to analyze their resonant frequencies. The change in resonant frequencies results in a high voltage and power output. The resistive loads are used in the circuit to find the electrical load. The frequency response is analyzed in three different inner (18 mm, 20 mm, 22 mm) and outer (23 mm, 25mm, 27 mm) active layer lengths of beams. As a result, the maximum voltage of 21.94 V with 13.67 mW power and 2.9 mA current is obtained at a resonant frequency of 51.06 Hz and 1 g acceleration amplitude, which are approximately 42%, 45% and 15% higher voltage, power and current obtained from the lowest performer of proposed piezoelectric cantilevers. The experiment results are validated using the hybrid DBN-SSO (Deep Belief Network based Salp Swarm Optimization) machine learning technique. The proposed DBN-SSO achieved 0.9998 and 0.9966 regression coefficients for voltage and power outputs, thus proving the fitness of predicted results with the experiments. As per findings, a 27 mm inner and 18 mm outer active layer based energy harvesting system is suggested as a suitable energy source where ever 10-12 mW power, 2.5-2.9 mA current and 20-21.94 V voltage are applicable.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":" 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135241529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Simulation of transient dynamic response of a locomotive considering its flexibility and rigidity 考虑柔刚度的机车暂态动力响应仿真

Noise and Vibration Worldwide Pub Date : 2023-11-06 DOI: 10.1177/09574565231212684

Rakesh Chandmal Sharma, Srihari Palli, Lokanadham Dharmana, Sunil Kumar Sharma, Ashwini Sharma, Ashwani Kharola, Neeraj Sharma

{"title":"Simulation of transient dynamic response of a locomotive considering its flexibility and rigidity","authors":"Rakesh Chandmal Sharma, Srihari Palli, Lokanadham Dharmana, Sunil Kumar Sharma, Ashwini Sharma, Ashwani Kharola, Neeraj Sharma","doi":"10.1177/09574565231212684","DOIUrl":"https://doi.org/10.1177/09574565231212684","url":null,"abstract":"Time-domain or transient dynamic response method is the most traditional method used to evaluate the dynamic response of a vibratory system subjected to deterministic inputs. The inertia or damping effects are very crucial in the time scale of loading. The present work determines the time domain analysis of railway locomotive using finite element analysis for Indian tracks. The track inputs are modelled as an ellipsoidal bump, and variations in displacement at different key locations of the truck and carbody models are plotted subjected to standard loading conditions. The response plot of the front and rear locations of the locomotive truck and carbody indicate that these regions are more responsive to wheel inputs in comparison to the mid portion due to unbalanced mass distribution. In the further study vertical-lateral random inputs are measured through track recording car and modelled to express in the form of PSD. These random inputs are provided to finite element modelled flexible bogie frame, and acceleration response is determined. The results obtained are compared with the same obtained from rigid bogie frame formulated using an analytical model. The results obtained from the flexible and rigid body models are found to be in good agreement.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"27 17","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135681292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical simulation and prediction of aerodynamic noise of high-speed trains 高速列车气动噪声的数值模拟与预测

Noise and Vibration Worldwide Pub Date : 2023-11-06 DOI: 10.1177/09574565231212687

Yanong Liu, Jun Zhang, Sitong Yi

{"title":"Numerical simulation and prediction of aerodynamic noise of high-speed trains","authors":"Yanong Liu, Jun Zhang, Sitong Yi","doi":"10.1177/09574565231212687","DOIUrl":"https://doi.org/10.1177/09574565231212687","url":null,"abstract":"In order to improve the efficiency of high-speed train aerodynamic noise analysis and provide a feasible method for aerodynamic noise prediction, the aerodynamic noise and its influencing factors are analyzed from the perspective of the total energy (sound power) radiated to the far field per unit time by the aerodynamic fundamental noise sources (monopole, dipole and quadrupole sources). A full-scale and a 1:8 scale-down computational fluid dynamics model of a high-speed train are established. The far-field sound pressure level at several receivers and velocities is calculated by using the transient large eddy simulation and the FW-H equation. The numerical simulation results are used to predict the aerodynamic noise under specified working conditions. The research work can achieve the prediction of aerodynamic noise at other velocities using noise data at known velocities on the same noise source case, as well as the prediction of aerodynamic noise of full-scale model using data of scale-down model, and is applicable to either bogies as local noise sources or the complete vehicle as a noise source. The maximum error between the prediction and simulation result is 0.33 dBA under various working conditions, which meets the engineering calculation requirements.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"17 9","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135684523","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on the vibration reduction characteristics of shock absorber throttle orifice in tractor suspension 拖拉机悬架减振器节流孔减振特性研究

Noise and Vibration Worldwide Pub Date : 2023-11-03 DOI: 10.1177/09574565231212690

Xin Zhang, Zengliang Xiao, Zhanlong Li, Yuanyou Liu

{"title":"Study on the vibration reduction characteristics of shock absorber throttle orifice in tractor suspension","authors":"Xin Zhang, Zengliang Xiao, Zhanlong Li, Yuanyou Liu","doi":"10.1177/09574565231212690","DOIUrl":"https://doi.org/10.1177/09574565231212690","url":null,"abstract":"The hydraulic shock absorber of a certain tractor suspension system is analyzed to determine the influence of the cross-sectional area ratio of the throttling holes of the restoration valve and the compression valve on the vibration damping performance of the whole vehicle, using a new method of machine-hydraulic co-simulation. First, the AMESim model of the hydraulic shock absorber is established, and the Kriging model is used to approximate the parameters of the AMESim hydraulic shock absorber model; the multi-island genetic algorithm and the gradient descent algorithm are used to obtain the three scenarios in which the cross-sectional area ratios of the throttle orifices of the same equivalent damping coefficients are greater than, equal to, or less than one. Then, a co-simulation model of 1/4 vehicle Recurdyn/AMESim and a co-simulation model of the whole vehicle with 162 degrees of freedom were established. The result show that, compared with the traditional method, this machine-hydraulic co-simulation method improves the calculation accuracy, calculation speed, and co-simulation model parameter accuracy. For low-speed conditions, when the throttle orifice area ratio equals 0.32, the minimum vehicle body center acceleration (root mean square value equal to 1.78 m/s 2 ) is achieved. For high-speed driving conditions, when the throttle orifice area ratio is approximately 3.1, the minimum vehicle body center acceleration (root mean square value equal to 3.52 m/s 2 ) is achieved.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"5 8","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135873884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A parameter optimization method of multi-layer nested slit resonator for the converter transformer noise in high voltage direct current converter station 高压直流换流站换流变压器噪声的多层嵌套狭缝谐振器参数优化方法

Noise and Vibration Worldwide Pub Date : 2023-11-03 DOI: 10.1177/09574565231212689

Li Li, Wei Sun, Linyong Li, Zhigang Chu

引用次数: 0

Effects of various aftwall edge ramp on open cavities in a confined supersonic flow 受限超声速流动中不同后壁边缘坡度对开腔的影响

Noise and Vibration Worldwide Pub Date : 2023-10-17 DOI: 10.1177/09574565231203256

S Sivapriya, S Thanigaiarasu, M Prasath

{"title":"Effects of various aftwall edge ramp on open cavities in a confined supersonic flow","authors":"S Sivapriya, S Thanigaiarasu, M Prasath","doi":"10.1177/09574565231203256","DOIUrl":"https://doi.org/10.1177/09574565231203256","url":null,"abstract":"An experimental study on the supersonic flow of Mach number 1.81 Over the rectangular cavity of L/D = 3 with different aft wall angles such as Baseline case 90° and aft wall edge ramp of 30°. Measurements of acoustic oscillations were carried out on the wall and floor of the cavity using unsteady pressure transducers. Schlieren flow visualization indicates the presence of a shear layer and the other shock features that are associated with the cavity flow field. In order to obtain the experimental results, data analysis was performed in the unsteady data Using statistical analytical techniques i.e., Fast Fourier Transform, Short Time Fourier Transform, and Coherence. After careful examination of the power spectra of the cavities, it is concluded that as the aft wall angle decreases by introducing the aft wall ramp, the amplitude decreases. It is clearly observed that the complete escape of vortices in Low angled cavity. From the correlation plot, the existence of the acoustic wave inside the cavity for all the cases is deduced. The maximum OASPL and static pressure values are observed at the aft wall. These results, the strength of the self-sustained oscillations and acoustic disturbance and mode switching were observed in the higher angled cavity 90°. Also, the mode switching co-existence was reduced in the aft wall edge ramp angle of 30°.","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136034216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ICONACES 2022 -Dr Lenin Babu 2022 年的标志--列宁-巴布博士

Noise and Vibration Worldwide Pub Date : 2023-10-14 DOI: 10.1177/09574565231209096

引用次数: 0

Guest editor biography- Dr. T.J. Sarvoththama Jothi 特邀编辑传记- T.J. Sarvoththama Jothi博士

Noise and Vibration Worldwide Pub Date : 2023-10-11 DOI: 10.1177/09574565231209115

引用次数: 0

Biography 传记

Noise and Vibration Worldwide Pub Date : 2023-10-10 DOI: 10.1177/09574565231209121

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Acoustic response of bi-directional functionally graded beam under axially varying load 轴向载荷作用下双向功能梯度梁的声响应

Noise and Vibration Worldwide Pub Date : 2023-09-26 DOI: 10.1177/09574565231203258

Somi Naidu Balireddy, Jeyaraj Pitchaimani, Lenin Babu Mailan Chinnapandi

{"title":"Acoustic response of bi-directional functionally graded beam under axially varying load","authors":"Somi Naidu Balireddy, Jeyaraj Pitchaimani, Lenin Babu Mailan Chinnapandi","doi":"10.1177/09574565231203258","DOIUrl":"https://doi.org/10.1177/09574565231203258","url":null,"abstract":"This paper investigates the effects of bi-directional gradation, length-to-height ratio, and end conditions on the acoustic behaviour of bi-directionally varying functional graded beams. The acoustic responses, including sound-power level (dB), sound-pressure level (dB), and sound-radiation efficiency, are evaluated using Rayleigh’s integral and modal superposition method. The sound power levels are presented up to the selected bandwidth, as well as the octave band center frequency. In contrast, the sound pressure levels are presented as contour plots and in directivity pattern. The buckling load, calculated for quadratically decreasing axial load, is applied in increments from 0 to its highest value. The study reveals that the highest value in the gradation indexes in both directions significantly influences the sound power levels. It is also evident from the study that thin beams have higher sound power levels compared to thick beams. The directivity pattern reveals that bi-directional functionally graded beams predict higher sound pressure levels at the critical buckling load. From the current acoustic study, it is observed that both structural and end stiffness are influential factors in sound power levels (dB) and sound pressure levels (dB).","PeriodicalId":55888,"journal":{"name":"Noise and Vibration Worldwide","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134960991","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0